- NAME
- Tcl_SetErrno, Tcl_GetErrno, Tcl_ErrnoId, Tcl_ErrnoMsg —
manipulate errno to store and retrieve error codes
- SYNOPSIS
- #include <tcl.h>
- void
- Tcl_SetErrno(errorCode)
- int
- Tcl_GetErrno()
- const char *
- Tcl_ErrnoId()
- const char *
- Tcl_ErrnoMsg(errorCode)
- ARGUMENTS
- DESCRIPTION
- KEYWORDS
Tcl_SetErrno, Tcl_GetErrno, Tcl_ErrnoId, Tcl_ErrnoMsg — manipulate
errno to store and retrieve error codes
#include <tcl.h>
void
Tcl_SetErrno(errorCode)
int
Tcl_GetErrno()
const char *
Tcl_ErrnoId()
const char *
Tcl_ErrnoMsg(errorCode)
- int errorCode
(in)
- A POSIX error code such as ENOENT.
Tcl_SetErrno and Tcl_GetErrno provide portable access
to the errno variable, which is used to record a POSIX error
code after system calls and other operations such as Tcl_Gets. These procedures are
necessary because global variable accesses cannot be made across
module boundaries on some platforms.
Tcl_SetErrno sets the errno variable to the value
of the errorCode argument C procedures that wish to return
error information to their callers via errno should call
Tcl_SetErrno rather than setting errno directly.
Tcl_GetErrno returns the current value of errno.
Procedures wishing to access errno should call this
procedure instead of accessing errno directly.
Tcl_ErrnoId and Tcl_ErrnoMsg return string
representations of errno values. Tcl_ErrnoId returns
a machine-readable textual identifier such as “EACCES” that
corresponds to the current value of errno.
Tcl_ErrnoMsg returns a human-readable string such as
“permission denied” that corresponds to the value of its
errorCode argument. The errorCode argument is
typically the value returned by Tcl_GetErrno. The strings
returned by these functions are statically allocated and the caller
must not free or modify them.
errno, error code, global variables
Copyright © 1996 Sun Microsystems, Inc.